Scoop and loader attachment for tractors



4 Sheets-Sheet l ATTOP/YEX 1964 .1. KOHORST ETAL 5000? AND LOADER ATTACHMENT FOR TRACTORS Original Filed Feb. 20, 1959 W SYN Dem 1964 J. KOHORST ETAL SCOOP AND LOADER ATTACHMENT FOR TRACTORS 4 Sheets-Sheet 2 Original Filed Feb. 20, 1959 ./V V E/V 7014 5.

JOJEPH KUHU/Pjf l mA/a/v JQSfP/f kw/owr 5y W 4 Tram/1.

Dec. 29, 1964 J. KOHORST ETAL SCOOP AND LOADER ATTACHMENT FOR TRACTORS 4 Sheets-Sheet 4 Original Filed Feb. 20, 1959 //V 1/5 /7025. JUSEPl/ KUHU/PJT VEPNO/V Jajf f/ K017014 57 United States Patent,

3,163,304 SCOOP AND LGADER ATTACHMENT FOR CTORS Joseph Kohorst and Vernon Joseph Kohorst, both of Rte. 1, Arcadia, Iowa Original application Feb. 20, 1959, Ser. No. 794,655, new Patent No. 3,079,621, dated Feb. 26, 1963, Divided and this application Jan. 23, 1962, Ser. No. 173,6ll8

4 Claims. ((31.214-140) One of the important objects contemplated herein is a the provision of a loader attachment for a tractor having improved means for elevating the same so as to provide maximum force in initially lifting a load.

Another object inhering herein is to provide a loader attachment of the above class having means for varying the height to which a load can be elevated.

A still further object of this invention is to provide a loader attachment for tractors that includes an improved scoop adjustable for handling a variety of materials.

Another important object is to provide an improved scoop for a tractor mounted'loader that may be converted to a dump bucket operation or to a cement carrier and depositing device. 7

Further objects include novel stabilizing 'means for the scoop during its use and means for adjusting the inclination of a pusher plate used therewith.

Other objects and advantages of this invention reside in the details of construction and correlation of the various parts and will be apparent as the description proceeds.

This invention consists of novel parts and combination of parts to be hereinafter described whereby the objects astraddle the tractor and the front wheel assembly 18 so as to be pivotally secured at respective opposite sides of the tractor to the rear axle and to extend forwardly therefrom beyond the wheels 18 for pivotal attachment to the scoop assembly 29 as will later be referred to in more detail. A transverse brace 22 connects beams 14 and 16 just rearwardly of scoop 20. v A pair of scissor type hoists indicated generallyat 24 are carried at the forward end of the tractor so that one is on each side thereof (FIG. 1) and supported by a dual frame means 26. Such frames are of like construction and are arranged relative to beams '14 and 16, and like parts'will be given like numerals although only the frame relative to beam 14 as seen in FIG. 1 will be descri'oed in detail. Frame 26 is generally of an inverted V-shape having a rear brace V 28 secured to the rearward portion of beam 14 andextending upwardly and forwardly therefrom to attachment to the outer end portion 3i? of a support bar 32 disposed at the side of the tractor engine 34 and extending transversely of the longitudinal axis thereof. A front brace 36 extends from theinner end portion 38 of support 32 downwardly and forwardly to the cross bar 22. Front set forth are obtained, as pointed out in the claims, and

illustrated in the accompanying drawings, in which:

FIG. 1 is a perspective view of a tractor showing a preferred embodiment of our invention mounted thereon, FIG. 2 is an enlarged perspective view of the scoop used with our loader attachment and having portions cutaway to more fully illustrate the construction thereof,-

FIG. 3 is a side elevational view of our loader attachment, partly in section and partially elevated, and showing the pusher plate on the scoop in its rearward position. FIG. 4 is a side elevational view similar to FIG. 3 showing the pusher plate in its forward position,

FIG. 5 is a side elevational view showing the scoop elevated with the broken lines indicating the dumping position of the scoop, I

FIG. 6 is a fragmentary perspective view illustrating the scoop converted for holding cement or the like to be delivered to a pointof use and showing the pusher plate 7 retracted,

FIG. 7 is a side elevational view of the device in FIG. 6 showing the pusher plate extended, j

FIGPS is a fragmentary perspective view of the scoop to show the releasable lock means between the-scoop and loader frame, and

FIGS. 9-11 inclusive are enlarged fragmentary side 'elevational views,partly in section, to indicate' the ad:

justable positions of inclination of the pusher plate.

.Referring to the drawings a tractor is designated gen-' erally by the numeral 12 and is illustrative of the type.

of equipment on which our invention is mounted. 'A frame structure for ourscoop and hoist apparatus includes of the rear a pair of elongated spaced beams 14 and 16 placed port 32 carries a pair of depending spaced ears 42 and at each side of the forward end of the tractor frame 44 there is a pair ofupstandmg spaced ear members 46:which, as seen in the drawings, is in a vertical plane of the axle of the front wheel assembly 18.

Hoist 224 comprises an upper 48 and lower 59 arm oppositely disposed relative to each other and pivotally secured together at their respective rearward ends as shown at 52. Theforward-end ofv the upper arm 48 is pivotally attached to cars 42 on support 32 and the forward end of arm Si is pivotally attached to cars 46 'on tractor frame 44. A hydraulic jack 54 has its cylinder end 56 pivotally attached to ears 46 and its plunger rod end similarly attached to the upper arm 48 intermediate the ends thereof. Arm 48 is provided with a plurality of spaced holes 57 to which the plunger rod of jack 54 can be selectively attached for increasing or decreasing 68 which are connected across their top edges by the plate or bar 70. The forward end of beams 14 and 16 are pivotally secured to the respective outer sides dzi'and 64 of scoop 2! (FIG; 2) so that no bolts or pins project inwardly within the confines of the scoop; This is accomplished by securing a plate '72 to the outerside of the scoop, said plate being turned out'and' back to form '7 a U bracket 74.' The forward end's'of'b'eams 14 audio are positioned in said respective brackets' 74 and a pin'76 passed through-bracket 74, the beam end and seats in 1 plate .72., Spaced cars 78 are provided on bracket 74 between which one end of pin '76 irests andano ther pin 3d locks pin '76 toears 7d, In'this'way pin 76cannot be dislodged and beams'l i and l d-are effec'tively pivotally a connected to the Scoop. Scoop fioor 60 is reinforced] against warping'and buckling by the depending spaced j ribs or=bars 32 to which is attached a" bottom S4'that. "5'

tapers upwardly in both afforwardly and rcction to plateoli as shown.

rearwardly di-i J and 146 can be. adjusted: as will later appear.

parallel square tubing members 86 extending from front to rear and mounted therein are the respective tines 88 that project forwardly of the scoop as shown in FIG. 4.

Tines 88 are secured at their rearward ends to floor by bolts 90 through tubing 86. A floor extension plate 92 (FIG. 4) has sides 94 and 96 provided with flanges 98 complementary in shape with flanges 66 on sides 62 and 64 and designed to abut against and be secured thereto by bolts 10!). Flanges 66' and 98 are also braced as shown at 102. Sides 94 and 96 also include integral rearwardly extending arms 1114 and 1136 that rest flush'on the top edge of the respective scoop sides 62 and 64 and are secured at their rearward end to the respective supports. 68 by bolts 108. Extension plate 92 is also provided with a plurality of spaced parallel square tubing members positioned respectively to register with tubing members 86 so as to constitute a longitudinal extension thereof for encasing tines 88. With extension plate 92 mounted as described and shown in FIG. 4 it will be seen that tines 88 project only a relatively small distance beyond the outer edge 112 of the plate. This provides a substantially closed-in scoop for handling free flowing grain and the like. Such extension unit is removable so that the tines 88 will project a substantial distance from floor plate 60 for use with such materials as hay, manure, and the like where more penetration of the tines is required and a closed scoop is not essential.

To aid in discharging a load from the scoop assembly, We have provided means for forcibly moving out or dumping material received in the scoop. Such means includes.

an upstanding pusher plate 114 positioned within the scoop for movement toward and away from the free ends of tines 88 as will later appear- Plate 114 has a forwardly inclined flange portion 115 along its upper edge and a similar flange 118 at the bottom. The bottom of flange 118 is notched 120 as required. to provide clearauce over the tubing 86 and 110 when the same is moved and otherwise is adapted to elfect a scraping action across the floor of the scoop. Such movement is provided by various linkage under hydraulic power and includes a shaft 122 rotatably mounted transversely of beams714 and 16to depending bearing members 124 on said respective beams and at a point intermediate tractor wheels 18 and the scoop 20. Shaft 122 projects beyond beam 14 (FIG. 1) and carries an integral arm or lever 126 disposed perpendicularly thereto; A two way acting hydraulic jack 128 has one end of the cylinder 130 pivotally attached to a bearing member 132 on beam 14 and the outer end of the cylinder rod 134 pivotally attached to lever 126. Fluid lines 136 and 138' connect cylinder 130 to hydraulic power on the tractor in a well known 'manner. shaft 122 about, its longitudinal axis.- On shaft 122' in parallel spaced relationship we have rigidly mounted a pair of arms 146 that project perpendicularly therefrom and when beams 14'and 16 are in lowered position such 2 arms 140 extend generally rearwardly and upwardly from Arms 140 terminate at shaft 122 as shown inVFIG. 1.

Thus operationof jack 128 will turn may be necessary to adjust the combined length of arms 144 and 146 as described.

On the inner side of each rear scoop support 68 (FIGS. 9-11) there is an elongated sleeve 154 having a depending tapered flange 156 which is pivotally attached to support 68 by a pin, bolt or the like 158. For this purpose, flange is provided with a plurality of vertically spaced holes and support 68 is similarly provided with spaced holes 162, the spacing of which is closer than for their upper ends in a hook member 142 to which there 5 is pivotally secured one end'of'a rigid link arm 144 that is telescopically journalled in an elongated arm extension 146, said arm .146 being pivotally secured at its outer end to an car 147* on the lower rear side offthe pusher plate 114. 144. and 146' are normally held against movement relativeto'ea'ch other by atransverse'pin 148 and a plurality of spaced holes 150 are provided in mm 144, so that the relative combinedlength of arms 144 Thus as holes 160. This permits holes 160 and 162 to be registered in diiierent combinations of whole and half hole adjustments whereby sleeve 154.can be attached to support 68 by pin 158 so as to adjust the inclination of plate 114 as shown. An elongated guide bar or arm 164 is rigidly secured to the rear side of plate 114 at each respective side thereof. and extends therefrom slidably through the respective sleeves 154 where their rearward free ends are free from attachment to any other part. In this way when plate 114 is moved in a push off action (FIG. 4) sleeve members 154 serve to guide and stabilize plate 114 against any lateral twisting. To hold sleeves 154 against free pivotal movement relative to supports 68 a spring means 166 connects at one end to an upstanding lip 168 on sleeve 154 and at the other end to an eye bolt 170 attached to bar 70. This permits sufiicient pivotal action of sleeve 154 to prevent bindingfof the guide bar 164 as it moves with the pusher plate 114 and also acts on the guide bars so as to urge the bottom edge of pusher plate portion 118 into contact with the scoop floor.

To hold the scoop assembly'20. against pivotal movement relative to beams 14 and 16 during a straight push off operation of plate 114, a bolt and nut means 172 (FIGS. 2 and 8) connects the outer side of each support 68 to the respective beams 14 and 16. Means 172 comprises ,a U bracket 174 open at the rear on support 68 and a bolt 176 with a clevis end 17 8 pivotally attached to an ear 189 on the respective beams 14 and 16. Bolt 176 is releasably engageable with bracket 174 by the lock bolts 182. r

To use scoop 20 with the push off'operation of plate 114 bolt means 172 is attachedto bracket 174 and floor plate 60 may be used with or without extension plate 92 as required. Plate 114 is then moved by rotation of shaft. 122 as described and-in the rearward movement of plate 114 it will be noted that the bottom edge is turned back and up to provide a curved runner means 184 for easily riding over the forward edge of tubing 86. The efliciency of scoop 20 has been increased byproviding a three sidedbox assembly 186 (FIGS. 6 and 7) which is attached to the forward side of plate 114 so that such plate serves as the. fourth box side and floor plates 60 and 22 can serve as the bottom. This makes it possible to load the box with cement,.for example, which can be deposited inany desired place. or form. To do this,

' -18Swhieh passes throughhole .189 in th .guide bar.

" sleeve 154' so that it will be readily available.

' .pos'itiom rotationof shaft 122'as described 'tiltsassembly Beams 14 and16' are elevated 24 and the location of such hoistand the direction of the a 20 .as shown in'FIG. 5: so as to'dump the content thereof.

Since plate 114 and guide bars-164 alsotilt'in this operm itlon, P1111138 securesthemtothe sleeves 1'54 so they cannot slide forwardly.- j I by the hoist assemblies In this lifting force applied is important in obtaining the greatest efficiency from the applied force. The scoop 20 will rise upwardly and rearwardly and the force of the jack 54 is applied in the same relative direction with the hoist arms rising and moving rearwardly as force is applied. By this arrangement, the hoists 24 move with the scoop and in the same direction rather than against the scoop as is frequently illustrated by similar devices. The net result is increased lifting power for any given power applied and makes it possible to obtain a satisfactory lifting means for the required purposes in a device of this type with a less powerful and less expensive hoist assembly.

It is submitted that the invention shown and described is aptly suited to achieve the purposes intended and is characterized by a combination of highly useful and mutually cooperating elements that combine their respective and proportionate functions in accomplishing the objects sought to be obtained.

It will be understood that the phraseology employed herein is for the purpose of description and not for limitation and that modifications and changes in the construction and arrangement of this invention can be made within the scope of what is claimed, without departing from the spirit and purpose thereof. It is thus intended to cover by the claims, any modified forms of structure or mechanical equivalents which may be reasonably included within their scope.

We claim:

1. In combination with a tractor having a pair of lifting beams pivotally connected to respective opposite sides of said tractor at the rear thereof, said beams carrying a scoop assembly on one end, a means for raising and lowering said beams, comprising an elevated support on said beams, a scissor type hoist including a pair of lifting arms pivotally secured together at one end so as to extend in a direction opposite to said scoop relative to the longitudinal axis of said tractor, the other end of one arm pivotally secured to said support, the other end of the other arm pivotally secured at the forward end of said tractor in vertical alignment over the front axle, a hydraulic jack pivotally connected atone end to the forward end of said tractor and at the other end pivotally connectible to selective spaced points on one of said arms, said jack designed to connect to a source of hydraulic power on said tractor, and the operation of said jack causing said hoist to move upwardly and rearwardly in a corresponding direction to that of the scoop.

2. In combination with a tractor having a pair of lifting beams pivotally connected respectively at opposite sides of said tractor at the rear thereof, said beams carrying a' scoop assembly on oneend, a means for raising andlowering said beams, comprising an inverted V-shaped frame carried by each beam so that each frame is at one respective side of the tractor engine and the apex of said frames are on a line substantially with the forward end of the tractor engine, a pair of scissor'type hoists each including a pair of lifting arms pivotally secured together at one end so as to extend in a direction opposite to said scoop relative to the longitudinal axis of said tractor, the other end of one arm of each respective hoist being pivotally secured to the apex of one of said frames, the other end of the other arm of each respective hoist being pivota'lly secured to respective opposed sides at the forward end of said tractor, in a vertical plane over the front axle thereof, a pair of hydraulic jacks each respectively pivotally connected at one end to respective opposed sides of the forward end of said tractor in a verfical plane over the front axle thereof and at the other end respectively'pivotally connectible to selective spaced points on one of said arms for selectively increasing and decreasing the speed of movement of said beams and for selectively increasing and decreasing the lifting power thereof,

said jacks designed to connect to a source of hydraulic power on said tractor, and the operation of saidjacks causing said hoist to' move upwardly and rearwardly in a corresponding direction to that of the scoop.

3'.- A loader attachment for a tractor, comprising a pair of elongated spaced beams designed to straddle a tractor engine so as to project forwardly therefrom and be pivotally secured at their rearward end to respective opposite sides of the rearward end of said tractor, the forward ends of said beams adapted for attachment to a load carrying device, scissor-type hoist means operatively connected between said tractor and said beams at each respective side of the forward end of the tractor engine so that the reaction force on said hoist is carried bythe front axle of said tractor, and means on said hoist means for selectively increasing and decreasing the lifting power and speed of movement thereof. 7 i

4. a loader attachment for a tractor, comprising a pair of elongated spaced beams designed to straddle a tractor engine so as to project forwardly therefrom and be pivotally secured at their rearward end to respective opposite sides of the rearward end of said tractor, frame means carried by each beam intermediatethe ends thereof, a hydraulically operated scissor-type hoist means at each respective side of the forward end of the tractor engine and arranged to transmit a reactionary force to the front axle of said tractor, each hoist means operatively connected between said tractor and said respective frame means, and each hoist means including a hydraulic jack adjustably connected thereto at selective points to selectively increase and decrease the lifting power thereof.

1 References Cited in the file of this patent UNITED STATES PATENTS 989,444 Thomas Apr. 11, 1911 2,371,661 Wilms Mar. 20, 1945 2,619,242 Crampton et a1. Nov. 25, 1952 2,670,862 I Siebring Mar. 2, 1954 2,691,244 Steinke Oct. 12, 1954 3,048,292 Kohorst et a1. Aug. 7, 1962 

1. IN COMBINATION WITH A TRACTOR HAVING A PAIR OF LIFTING BEAMS PIVOTALLY CONNECTED TO RESPECTIVE OPPOSITE SIDES OF SAID TRACTOR AT THE REAR THEREOF, SAID BEAMS CARRYING A SCOOP ASSEMBLY ON ONE END, A MEANS FOR RAISING AND LOWERING SAID BEAMS, COMPRISING AN ELEVATED SUPPORT ON SAID BEAMS, A SCISSOR TYPE HOIST INCLUDING A PAIR OF LIFTING ARMS PIVOTALLY SECURED TOGETHER AT ONE END SO AS TO EXTEND IN A DIRECTION OPPOSITE TO SAID SCOOP RELATIVE TO THE LONGITUDINAL AXIS OF SAID TRACTOR, THE OTHER END OF ONE ARM PIVOTALLY SECURED TO SAID SUPPORT, THE OTHER END OF THE OTHER ARM PIVOTALLY SECURED AT THE FORWARD END OF SAID TRACTOR IN VERTICAL ALIGNMENT OVER THE FRONT AXLE, A HYDRAULIC JACK PIVOTALLY CONNECTED AT ONE END TO THE FORWARD END OF SAID TRACTOR AND AT THE OTHER END PIVOTALLY CONNECTIBLE TO SELECTIVE SPACED POINTS ON ONE OF SAID ARMS, SAID JACK DESIGNED TO CONNECT TO A SOURCE OF HYDRAULIC POWER ON SAID TRACTOR, AND THE OPERATION OF SAID JACK CAUSING SAID HOIST TO MOVE UPWARDLY AND REARWARDLY IN A CORRESPONDING DIRECTION TO THAT OF THE SCOOP. 